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unable to connect to sql server

I am trying to insert data's to my sql server and I'm getting this error.

Unable to open the physical file "C:\Users\Admin\Desktop\Project\MIS\MIS\MIS\MusicalInstrumentalStore.UI\MusicalInstrumentalStore.UI\App_Data\aspnetdb.mdf". Operating system error 2: "2(failed to retrieve text for this error. Reason: 15105)".
Cannot attach the file 'C:\Users\Admin\Desktop\Project\MIS\MIS\MIS\MusicalInstrumentalStore.UI\MusicalInstrumentalStore.UI\App_Data\aspnetdb.mdf' as database 'Adventure'.